39382941721 has 2 divisors, whose sum is σ = 39382941722. Its totient is φ = 39382941720.

The previous prime is 39382941691. The next prime is 39382941797. The reversal of 39382941721 is 12714928393.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38998350400 + 384591321 = 197480^2 + 19611^2 .

It is a cyclic number.

It is not a de Polignac number, because 39382941721 - 2⁷ = 39382941593 is a prime.

It is not a weakly prime, because it can be changed into another prime (39382941121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19691470860 + 19691470861.

It is an arithmetic number, because the mean of its divisors is an integer number (19691470861).

Almost surely, 2^39382941721 is an apocalyptic number.

It is an amenable number.

39382941721 is a deficient number, since it is larger than the sum of its proper divisors (1).

39382941721 is an equidigital number, since it uses as much as digits as its factorization.

39382941721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The spelling of 39382941721 in words is "thirty-nine billion, three hundred eighty-two million, nine hundred forty-one thousand, seven hundred twenty-one".